In this IoT projects, I have shown you how to make the smart home with Google Assistant & Alexa using NodeMCU ESP8266 to control relays with voice commands and manual switches. I have used all the free tools for this IoT-based home automation system.

$2 for 1-4 Layer PCBs, Get SMT Coupons: https://jlcpcb.com/RHS

Download PCB Gerber file for this NodeMCU IoT based home automation project
https://drive.google.com/uc?export=do...

During the tutorial video, I have covered the following topics:
00:22 Control appliances with Google Assistant and Alexa using NodeMCU
01:11 Control appliances manually with switches.
02:36 Required Components for this NodeMCU project.
02:49 Circuit diagram of NodeMCU home automation project.
04:07 How to create and configure Sinric Pro account.
05:37 Program NodeMCU with Arduino IDE
07:37 Setup Amazon Alexa App to add IoT devices.
08:41 Setup Google Home App to control NodeMCU with Google Assistant.
09:46 Control relays with voice using Google Assistant

Required Components for each room for this NodeMCU home automation
1. NodeMCU
2. 4-channel 5V SPDT Relay Module
3. Switches or Push Buttons

Amazon India Affiliate links:
NodeMCU : https://amzn.to/3fJA4EG
4-channel 5V Relay Module : https://amzn.to/2BQ5Y3o
Echo Dot Alexa(4th Gen) : https://amzn.to/3srCiPA

Amazon United States Affiliate links:
NodeMCU : https://amzn.to/2WoR2A2
4-channel 5V Relay Module : https://amzn.to/3r2HuJ4

Required Components for the NodeMCU control Relay Module PCB:
1. Relays 5v (SPDT) (4 no)
2. BC547 Transistors (4 no)
3. PC817 Optocuplors (4 no)
4. 510-ohm 0.25-watt Resistor (4 no) (R1 -- R4)
5. 1k 0.25-watt Resistors (5 no) (R5 -- R9)
6. LED 5-mm (5 no)
7. 1N4007 Diodes (4 no) (D1 -- D4)
8. Push Buttons (4 no)
9. Terminal Connectors
10. 5V DC supply

**Here I can control all 4 relays manually with switches. But as I have used the free Sinric Pro account, so I can control 3 devices with Google Assistant and Alexa. To control the fourth device, you have to purchase 1 device in Sinric Pro.

**If you use Switch, then the Switch-2 must be turned off during the booting process of NodeMCU. But for push-button, there is no such limitation.

**You don't need any Alexa devices like Echo Dot or Google Home Mini. You can just use Google Home App and Alexa App for this IoT project.

Download Code for this NodeMCU smart house automation project from the following article
https://iotcircuithub.com/smart-home-...

During the internet of things tutorial video, I have explained all the steps to make this NodeMCU ESP8266 smart home system with Sinric Pro to control the home appliances with and without internet. I have made this Google Assistant control smart home system without IFTTT. If the NodeMCU connected with WiFi then you can control the relays from anywhere in the world with Alexa and Google Assistant. And you can also monitor the real-time feedback in the Amazon Alexa and Google Home IoT applications. So with this smart house project, you can convert any appliance to IoT devices and control them through the internet.

So, now you can just ask Google Assistant, "Hey Google, turn off lights", or "Alexa, turn on light". that's it.

#internetofthings #homeautomation #googleassistant
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